The following subclasses beginning with the letter E are E-subclasses.
Each E-subclass corresponds in scope to a classification in a foreign
classification system, for example, the European Classification system (ECLA).
The foreign classification equivalent to an E-subclass is identified in
the subclass definition. In addition to US documents classified in
E-subclasses by US examiners, documents are regularly classified in
E-subclasses according to the classification practices of any foreign
Offices identified in parentheses at the end of the title. For example,
"(EPO)" at the end of a title indicates both European and
US patent documents, as classified by the EPO, are regularly added to the
subclass. E-subclasses may contain subject matter outside the scope of
this class.Consult their definitions, or the documents themselves to
clarify or interpret titles.